Grounded tax intelligence

Tax answers you can trace to the source.

Spak is a retrieval-grounded assistant for U.S. federal and California tax. Every answer is pulled from current IRS and FTB publications — and shows its citations, not a confident guess.

Ask a question See the stack retrieval · rerank · deterministic calc
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FastMCP · :8300
Grounded answer
Fed + CA
two jurisdictions, one answer
100%
answers carry a source citation
Deterministic
calculator, not a guessed number
Streaming
responses as they're composed
It shows its work

Ask in plain English. Get an answer with receipts.

Most chatbots will happily invent a tax figure. Spak won't. It retrieves the governing passage first, computes anything numeric with a deterministic calculator, and attaches the citation so you can verify it yourself.

Built for filers, advisors, and anyone tired of "consult a professional" as the only answer.

Do I pay California tax on a Roth conversion?
Yes. California taxes a Roth conversion as ordinary income in the year you convert — it conforms to the federal treatment, with no special state exclusion. The converted amount flows onto Schedule CA (540).
IRS Pub 590-A CA R&TC §17501
Under the hood

A retrieval stack built to be trusted.

Spak 2.0 rebuilds the original 2018 intent-classification bot as a modern RAG system. Every layer earns its place — retrieval, reranking, and a deterministic engine working in concert.

Build notes

Decisions, and the tradeoffs behind them.

Ask Spak · interactive demo
Put a question to it.

A hands-on demo with sample answers across common topics. The full Spak handles any question by retrieving and citing the governing IRS or FTB source.

Answers appear here. Try one of the questions above.
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